* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.container {
  display: grid;
  grid-template-columns: 200px auto;
  height: 600px;

  border: 1px solid pink;
  margin: 100px auto;
}

.child {
  border: 1px solid skyblue;
}
